Search Publications
Ultraviolet Mg II emission from fast neutral ejecta around Eta Carinae
Smith, Nathan; Morse, Jon A.
We present the first images of the nebula around η Carinae obtained with the Wide Field Camera 3 (WFC3) onboard the Hubble Space Telescope (HST), including an ultraviolet (UV) image in the F280N filter that traces Mg II emission, plus contemporaneous imaging in the F336W, F658N, and F126N filters that trace near-UV continuum, [N II], and [Fe II], …
Analysis of layering-related linear features on comet 67P/Churyumov-Gerasimenko
Penasa, Luca; Boehnhardt, Hermann; Remetean, Emile +4 more
We analysed layering-related linear features on the surface of comet 67P/Churyumov-Gerasimenko (67P) to determine the internal configuration of the layerings within the nucleus. We used high-resolution images from the OSIRIS Narrow Angle Camera onboard the Rosetta spacecraft, projected on to the SHAP7 shape model of the nucleus, to map 171 layerin…
On the ultra-compact nature of the neutron star system 1RXS J170854.4-321857: insights from X-ray spectroscopy
Armas Padilla, M.; López-Navas, E.
The relatively small family of ultra-compact X-ray binary systems is of great interest for many areas of astrophysics. We report on a detailed X-ray spectral study of the persistent neutron star low-mass X-ray binary 1RXS J170854.4-321857. We analysed two XMM-Newton observations obtained in late 2004 and early 2005 when, in agreement with previous…
Searching for correlations in Gaia DR2 unbound star trajectories
García-Bellido, J.; Barrado, D.; Montanari, F.
Scattering events with compact objects are expected in the primordial black hole (PBH) cold dark matter (CDM) scenario, due to close encounters between stars and PBHs in the dense environments of dwarf spheroidals. We develop a Bayesian framework to search for correlations among Milky Way stellar trajectories and those of globular clusters and dwa…
Chemical evolution of HC3N in dense molecular clouds
Wang, Jun-Jie; Xu, Jin-Long; Yu, Naiping
We investigated the chemical evolution of HC3N in six dense molecular clouds, using archival available data from the Herschel infrared Galactic Plane Survey (Hi-GAL) and the Millimeter Astronomy Legacy Team Survey at 90 GHz (MALT90). Radio sky surveys of the Multi-Array Galactic Plane Imaging Survey (MAGPIS) and the Sydney University Mo…
New variable stars towards the Galactic Bulge - I. The bright regime
Rejkuba, M.; Anderson, J.; Zoccali, M. +8 more
We report the detection of 3714 variable stars towards the Galactic bulge, including 2521 previously uncatalogued variables, using time-series photometry extracted from data obtained with the VIMOS imager at the Very Large Telescope. Observations of the Sagittarius Window Eclipsing Extrasolar Planet Search (SWEEPS) field in the Galactic Bulge were…
NuSTAR and XMM-Newton observations of SXP 59 during its 2017 giant outburst
Weng, Shan-Shan; Ge, Ming-Yu; Zhao, Hai-Hui
The Be X-ray pulsar (BeXRP) SXP 59 underwent a giant outburst in 2017 with a peak X-ray luminosity of 1.1 × 1038 erg s-1. We report on the X-ray behaviour of SXP 59 with the XMM-Newton and NuSTAR observations collected at the outburst peak, decay, and the low luminosity states. The pulse profiles are energy dependent, the pul…
Inflowing gas in the central parsec of M81
Devereux, Nick
Spectroscopic observations of the Seyfert 1/Liner nucleus of M81, obtained recently with the Space Telescope Imaging Spectrograph aboard the Hubble Space Telescope(HST), have revealed an ultraviolet (UV)-visible spectrum rich with emission lines of a variety of widths, ionization potentials, and critical densities, including several in the UV that…
Tiny grains shining bright in the gaps of Herbig Ae transitional discs
Monnier, John D.; Kraus, Stefan; Federrath, Christoph +7 more
This work presents a study of two Herbig Ae transitional discs, Oph IRS 48 and HD 169142; which both have reported rings in their dust density distributions. We use Keck-II/NIRC2 adaptive optics imaging observations in the L' filter (3.8 µm) to probe the regions of these discs inwards of {∼ }20 au from the star. We introduce our method for i…
The 2018 eruption and long-term evolution of the new high-mass Herbig Ae/Be object Gaia-18azl = VES 263
Munari, U.; Banerjee, D. P. K.; Čotar, K. +10 more
We have been monitoring, at high cadence, the photometric and spectroscopic evolution of VES 263 following the discovery in 2018 of a brightening labelled as event Gaia-18azl. VES 263 is so far a neglected emission-line object discovered in the 1960s on objective prism plates, tentatively classified as a semiregular AGB cool giant by automated ana…